Directions:

Cake:
Grease bottom of 15 1/2-inch by 1-inch baking pan. Line with waxed paper; set aside.

In large bowl, combine butter, brown sugar and granulated sugar; beat until creamy. Add eggs, one at a time, beating well after each addition. Add vanilla extract and salt; mix well. Gradually add flour. Stir in 1 cup miniature chocolate chips. Spread batter into prepared pan and bake at 350 degrees for 20-25 minutes. Cool completely.

Frosting:
Melt over hot (not boiling) water 1 cup miniature chocolate chips; stir until smooth. Set aside.

In small bowl, combine butter and confectioners' sugar; beat until creamy. Add melted chocolate and vanilla extract; blend until smooth.

To assemble:
Loosen sides of cake. Invert onto lightly floured cloth. Peel off waxed paper. Trim edges of cake; cut cake crosswise into four 3 3/4- by 10-inch sections. Spread 3 slightly rounded tablespoons frosting on one cake layer. Top with second cake layer. Repeat layers of frosting and cake. Frost entire cake with remaining frosting.